Winckler et al. (2010, in review): "We use the distribution of helium isotopes along an oceanic transect at 67°S to identify previously unobserved hydrothermal activity in the Pacific sector of the Southern Ocean.", "We identify three complete ridge segments, a portion of a fourth segment and two isolated locations on the Pacific Antarctic Ridge between 145°W and 175°W (representing ~540 km of ridge in total) as the potential source of the newly observed plume."

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Year and How Discovered (if active, visual confirmation is listed first):